<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Title</title>
</head>
<body>
    <div id="app">
        <h2>{{content}}</h2>
        <h2 v-html="content">你好</h2>
    </div>
    <script src="https://unpkg.com/vue@3"></script>
    <script>
        const app=Vue.createApp({
            data(){
                return{
                    content:`
                        <span style="color:red;font-size:30px;">哈哈哈</span>
                    `
                }
            },
            methods:{

            }
        })
        app.mount("#app")
    </script>
</body>
</html>